4) Nicotinamide is an important vitamin for metabolism and is soluble in water. The deficiency of this vitamin is pellagra causes a disease called. Nicotinamide 59.0% C by mass: 5.0% H; 22.9% N; 13.1% contains. 3.88 g nicotinamide by adding 30.0 ml nitrobenzene, a Hs NO, (d = 1.204 g/ml) freezing point decreases from 5.7°C to -1.4 C. What is the molecular formula of this compound? (Kd for nitrobenzene -8,1 C/m) Molecular masses (g/mol): Na - 22,9898; Mg - 24,3050; As = 107.868; H = 1,00794; C = 12,0107; 0 15,9994: